diff --git a/composer.json b/composer.json
index 6210b09..aeab6a3 100644
--- a/composer.json
+++ b/composer.json
@@ -21,11 +21,11 @@
         }
     ],
     "require": {
-        "silverstripe/framework": "^4.4@dev",
+        "silverstripe/framework": "^4.10",
         "silverstripe/cms": "^4.4@dev"
     },
     "require-dev": {
-        "sminnee/phpunit": "^5.7",
+        "phpunit/phpunit": "^9",
         "squizlabs/php_codesniffer": "^3.0"
     },
     "extra": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index f148411..69df172 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,7 +1,9 @@
 <phpunit bootstrap="vendor/silverstripe/cms/tests/bootstrap.php" colors="true">
-    <testsuite name="Default">
-        <directory>tests</directory>
-    </testsuite>
+    <testsuites>
+        <testsuite name="Default">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
 
     <filter>
         <whitelist addUncoveredFilesFromWhitelist="true">
diff --git a/tests/ShareDraftContentSiteTreeExtensionTest.php b/tests/ShareDraftContentSiteTreeExtensionTest.php
index c2d6d8a..42208e4 100644
--- a/tests/ShareDraftContentSiteTreeExtensionTest.php
+++ b/tests/ShareDraftContentSiteTreeExtensionTest.php
@@ -77,7 +77,7 @@ public function testShareTokenLink()
         $controller = new ShareDraftController();
         $response = $controller->preview($request);
 
-        $this->assertContains('share-draft-content-message', $response);
+        $this->assertStringContainsString('share-draft-content-message', $response);
 
         $request = new HTTPRequest('GET', $firstShareLink);
 
@@ -89,6 +89,6 @@ public function testShareTokenLink()
         $controller = new ShareDraftController();
         $response = $controller->preview($request);
 
-        $this->assertContains('share-draft-error-page', $response);
+        $this->assertStringContainsString('share-draft-error-page', $response);
     }
 }